Coordinate errors in Coords model

[CresitelloDittmar, Mark]

Laurent,

Thanks for the comment, and I agree.. the distinction between them needs to
be very clear.

How about if I add a short glossary in both the Coords and Measurement
models.. maybe in the Model section, that defines the 3 terms which are
generally involved in the discussion on these objects.
  Quantity: [ivoa model]  A number with a unit.
  Coordinate: [coords model]  An absolute location within a coordinate
space.  Comprised of a 'value' (often a Quantity), along an associated axis
in a coordinate space, and a coordinate frame providing additional metadata
about the orientation and origin of the coordinate space.
  Measurement: [meas model]  For 'measured', or 'determined' data.
Combines a Coordinate (ie: the determined value) with corresponding
Error(s).

Mark


On Tue, Jun 11, 2019 at 6:04 AM Laurent MICHEL <
laurent.michel at astro.unistra.fr> wrote:

> Dear all,
>
> I started to read the STC trilogy by Coords and I think the Coordinate
> role needs some clarification.
>
> It is written (4.1) that a coordinate "... represent an absolute
> location within a coordinate space..."
>
> Having read that, I expect to get here anything describing my
> coordinate. But this is not the case; e.g. there no ne error.
>
> I guess that the Meas model doing the job, and I think that the bridge
> between the 2 models must be clearly stated in the document.
>
> Laurent
>
> --
> ---- Laurent MICHEL              Tel  (33 0) 3 68 85 24 37
>       Observatoire de Strasbourg  Fax  (33 0) 3 68 85 24 32
>       11 Rue de l'Universite      Mail laurent.michel at astro.unistra.fr
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> ---
>
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